VMS Help TCPIP Services, Programming Interfaces, RPC Client Routines, clnt_broadcast, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 prognum
    The program number associated with the remote procedure.
 versnum
    The version number associated with the remote procedure.
 procnum
    The procedure number associated with the remote procedure.
 inproc
    The XDR routine used to encode the remote procedure's arguments.
 in
    A pointer to the remote procedure's arguments.
 outproc
    The XDR routine used to decode the remote procedure's results.
 out
    A pointer to the remote procedure's results.
 eachresult
    Called each time the routine receives a response. Specify the
    routine as follows:
    int eachresult(char *resultsp, struct sockaddr_in *addr)
    resultsp is the same as the parameter passed to clnt_broadcast(),
    except that the remote procedure's output is decoded there. addr
    is a pointer to a sockaddr_in structure containing the address of
    the host that sent the results.
    If eachresult is NULL, the clnt_broadcast routine returns without
    waiting for any replies.